Terminal, wireless communication method, base station and system

Abstract

A terminal according to an aspect of the present disclosure comprises: a reception unit that receives a plurality of pieces of downlink control information respectively transmitted by using a plurality of downlink control channels allocated to different time domains; and a control unit that controls reception and / or transmission of a physical shared channel scheduled on the basis of the pieces of downlink control information. When the contents of timing-related information included in the pieces of downlink control information are identical, the control unit determines a reception timing and / or a transmission timing of the physical shared channel on the basis of the timing-related information by using a specific downlink control channel as a time reference.

Description

[Technical field]

[0001] The present disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system. 、 base station and systems Regarding. [Background technology]

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of achieving higher data rates and lower latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of achieving higher capacity and greater sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In future wireless communication systems (e.g., NR), it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs) will use one or more panels (multi-panels) to perform DL transmission (e.g., PDSCH transmission) to a terminal (user terminal, User Equipment (UE)).

[0006] In addition, in NR, it is assumed that repetitive transmission is applied to a specific channel (e.g., PDCCH). For example, it is possible to control the schedule of DL transmission / UL transmission by using multiple PDCCHs to which repetitive transmission is applied from a multi-panel / TRP.

[0007] However, in the NR specifications to date, there has been insufficient consideration of how to control repeated transmissions from one or more TRPs.

[0008] Therefore, the present disclosure provides a terminal and a wireless communication method capable of appropriately performing communication even when repeated transmission is applied to DL channels transmitted from one or more TRPs. 、 base station and systems One of the aims is to provide. [Means for solving the problem]

[0009] A terminal according to an embodiment of the present disclosure includes a receiver that receives a plurality of PDCCHs (Physical Downlink Control Channels) assigned to different time domains, and a control unit that controls to use a later PDCCH among the plurality of PDCCHs as a time reference according to terminal processing based on the plurality of PDCCHs. The receiving unit receives a plurality of DCIs (Downlink Control Information) respectively transmitted using the plurality of PDCCHs, and the control unit controls counts of counter DAIs (Downlink Assignment Indicators) respectively included in the plurality of DCIs, assuming that the counter DAIs respectively included in the plurality of DCIs have the same value, based on a specific PDCCH among the plurality of PDCCHs. The present invention is characterized by the above. Effect of the Invention

[0010] According to one embodiment of the present disclosure, communication can be performed appropriately even when repeated transmission is applied to DL channels transmitted from one or more TRPs. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of schedule control of a physical shared channel based on a PDCCH / DCI. [Diagram 2] 2A-2D are diagrams illustrating an example of a multi-TRP scenario. [Diagram 3] FIG. 3 is a diagram illustrating an example of PDCCH repeated transmission. [Figure 4] FIG. 4 is a diagram illustrating an example of PDCCH repeat transmission control in the second aspect. [Diagram 5] 5A and 5B are diagrams showing another example of PDCCH repeat transmission control in the second aspect. [Figure 6] 6A and 6B are diagrams showing another example of PDCCH repeat transmission control in the second aspect. [Figure 7] 7A and 7B are diagrams illustrating another example of PDCCH repeat transmission control in the second aspect. [Figure 8] FIG. 8 is a diagram illustrating an example of PDCCH repeat transmission control in the third aspect. [Figure 9] FIG. 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 11] FIG. 11 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <Time domain resource allocation> In existing systems (e.g., Rel. 15), time domain resource allocation information for a physical shared channel (at least one of PDSCH and PUSCH) is included in downlink control information (DCI). A network (e.g., a base station) notifies a UE of information on a time domain resource in which a physical shared channel scheduled in the DCI is scheduled, using a predetermined field (e.g., a TDRA field) included in the DCI.

[0013] The information regarding the time domain resource may include, for example, at least one of information indicating an offset between the DCI and the physical shared channel (e.g., slot offset K0), information indicating a start symbol (e.g., start symbol S), and information indicating a length of the physical shared channel (e.g., length L).

[0014] Each bit information (or code point) notified in the TDRA field may be associated with a different time domain resource allocation candidate (or entry). For example, a table (e.g., a TDRA table) in which each bit information is associated with the time domain resource allocation candidates (K0, S, L) may be defined. The time domain resource allocation candidates may be predefined in the specification, or may be notified / configured to the UE by higher layer signaling.

[0015] [PDSCH] The UE may determine a row index (entry number or entry index) in a predetermined table based on a value of a TDRA field in a DCI (e.g., DCI format 1_0 / 1_1 / 1_2). The predetermined table may include at least one of information indicating a time offset (e.g., slot offset K0) between the DCI and a PDSCH scheduled by the DCI, information indicating a mapping type of the PDSCH, and a start symbol S and a time length L of the PDSCH. The combination of the start symbol S and the time length L of the PDSCH may be referred to as a Start and Length Indicator (SLIV).

[0016] The UE may determine the time domain resource in which the PDSCH is scheduled based on at least one of the value of a predetermined field included in the DCI and the slot offset K0 information, mapping type, start symbol S, symbol length L, and SLIV specified in the table (see FIG. 1). Note that the reference points of the start symbol S and the symbol length L may be controlled based on the start position (first symbol) of the slot. Also, the start symbol S, the symbol length L, etc. may be defined according to the mapping type of the PDSCH.

[0017] As shown in FIG. 1, the UE determines the slot in which the PDSCH is scheduled by using the DCI (or the PDCCH used to transmit the DCI) as a reference point in the time domain. For example, when the UE receives DCI that schedules the PDSCH in slot #n, the UE determines the slot number n and the subcarrier spacing μ PDSCH , the subcarrier spacing for PDCCH μ PDCCH Based on at least one of the time offsets K0, the slot for receiving the PDSCH (allocated to the PDSCH) may be determined. Here, the case is shown in which the slot offset K0=1, and the subcarrier intervals of the PDSCH and the PDCCH are the same.

[0018] Furthermore, the UE determines the allocation of the PDSCH based on the start point of the slot to which the PDSCH is allocated, for resource allocation information (e.g., SLIV) specified in the TDRA field. Note that the reference point may be called a reference point or a reference point.

[0019] [PUSCH] The UE may determine a row index (entry number or entry index) in a predetermined table based on a value of a TDRA field in a DCI (e.g., DCI format 0_0 / 0_1 / 0_2). The predetermined table may include at least one of information indicating a time offset (e.g., slot offset K2) between the DCI and a PUSCH scheduled by the DCI, information indicating a mapping type of the PUSCH, and a start symbol S and a time length L of the PUSCH. The combination of the start symbol S and the time length L of the PUSCH may be referred to as a Start and Length Indicator (SLIV).

[0020] The UE may determine the time domain resource in which the PUSCH is scheduled based on at least one of the value of a predetermined field included in the DCI and the slot offset K2 information, mapping type, start symbol S, symbol length L, and SLIV defined in the table (see FIG. 1). Note that the reference points of the start symbol S and the symbol length L may be controlled based on the start position (first symbol) of the slot. Also, the start symbol S, the symbol length L, etc. may be defined according to the mapping type of the PDSCH.

[0021] As shown in FIG. 1, the UE determines the slot in which the PUSCH is scheduled by using the DCI (or the PDCCH used to transmit the DCI) as a reference point in the time domain. For example, when the UE receives DCI that schedules the PUSCH in slot #n+4, the UE determines the slot number n+4 and the subcarrier spacing μ for the PUSCH. PDSCH , the subcarrier spacing for PUCCH μ PDCCHA slot for transmitting the PUSCH (allocated to the PUSCH) may be determined based on at least one of the time offsets K2. Here, a case is shown in which the slot offset K2=3, and the subcarrier intervals of the PDSCH and the PDCCH are the same.

[0022] Furthermore, the UE determines the allocation of the PUSCH based on the start point of the slot to which the PUSCH is allocated, for resource allocation information (eg, SLIV) specified in the TDRA field.

[0023] (Multi-TRP) In NR, one or more transmission / reception points (TRPs) (multi-TRPs) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs.

[0024] Note that multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0025] 2A-2D are diagrams illustrating an example of a multi-TRP scenario, assuming, but not limited to, that each TRP is capable of transmitting four different beams.

[0026] 2A shows an example of a case where only one TRP (TRP1 in this example) of the multiple TRPs transmits to the UE (may be called single mode, single TRP, etc.). In this case, TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.

[0027] 2B shows an example of a case where only one TRP (TRP1 in this example) of the multiple TRPs transmits a control signal to the UE, and the multiple TRPs transmit data signals (may be called a single master mode). The UE receives each PDSCH transmitted from the multiple TRPs based on one Downlink Control Information (DCI).

[0028] FIG. 2C shows an example of a case where each of the multiple TRPs transmits a part of the control signal to the UE and the multiple TRPs transmit data signals (which may be called a master-slave mode). Part 1 of the control signal (DCI) may be transmitted in TRP1, and part 2 of the control signal (DCI) may be transmitted in TRP2. Part 2 of the control signal may depend on part 1. The UE receives each PDSCH transmitted from the multiple TRP based on these parts of DCI.

[0029] 2D shows an example of a case where each of the multiple TRPs transmits a separate control signal to the UE, and the multiple TRPs transmit data signals (which may be called a multi-master mode). A first control signal (DCI) may be transmitted from TRP1, and a second control signal (DCI) may be transmitted from TRP2. The UE receives each PDSCH transmitted from the multiple TRPs based on these DCIs.

[0030] When multiple PDSCHs from multiple TRPs as shown in FIG. 2B (which may be called multiple PDSCHs) are scheduled using one DCI, the DCI may be called single DCI (S-DCI, single PDCCH). Also, when multiple PDSCHs from multiple TRPs as shown in FIG. 2D are scheduled using multiple DCIs, these multiple DCIs may be called multiple DCI (M-DCI, multiple PDCCHs).

[0031] Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. As one form of multi-TRP transmission, non-coherent joint transmission (NCJT) is being considered.

[0032] In the NCJT, for example, TRP1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP2 performs modulation mapping and layer mapping on a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0033] In addition, multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with at least one of the time and frequency resources.

[0034] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0035] In URLLC for multiple TRPs, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is supported. It is considered that repetition schemes (URLLC schemes, for example, schemes 1, 2a, 2b, 3, and 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain are supported. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0036] Such a multi-TRP scenario allows for more flexible transmission control using channels with better quality.

[0037] NCJT with multiple TRPs / panels may use high rank. To support ideal and non-ideal backhaul between multiple TRPs, both single DCI (single PDCCH, e.g., FIG. 2B) and multiple DCI (multiple PDCCH, e.g., FIG. 2D) may be supported. For both single DCI and multiple DCI, the maximum number of TRPs may be 2.

[0038] For single PDCCH design (mainly for ideal backhaul), TCI extension is considered. Each TCI codepoint in DCI may correspond to TCI state 1 or 2. TCI field size may be the same as that of Rel.15.

[0039] Incidentally, in Rel.17 and later, it is assumed that repetitive transmission (PDCCH repetition) is applied to PDCCH (or DCI) transmitted from one or more TRPs. For example, it is conceivable to schedule or instruct transmission / reception of one or more signals / channels by using multiple PDCCHs (or DCI) transmitted from one or more TRPs.

[0040] The PDCCH / DCI to which repetitive transmission is applied may be called multi-PDCCH / multi-DCI. Repetitive transmission of PDCCH may be read as PDCCH repetition, multiple transmission of PDCCH, multi-PDCCH transmission, or multiple PDCCH transmission.

[0041] The multi-PDCCH / multi-DCI may be transmitted from different TRPs. The multi-PDCCH / DCI may be multiplexed by time multiplexing (TDM) / frequency multiplexing (FDM) / spatial multiplexing (SDM). For example, when PDCCH repetition (TDM PDCCH repetition) is performed using time multiplexing, PDCCHs transmitted from different TRPs are assigned to different time domains.

[0042] Assume that one or more physical shared channels are scheduled using the multi-PDCCH / DCI. The one or more physical shared channels may be, for example, the same (or one) physical shared channel, or multiple physical shared channels scheduled in the same time domain. In this case, how to control the schedule (for example, the contents to be notified by each DCI, the reference point at the time of scheduling, etc.) becomes an issue.

[0043] For example, if the contents of DCI transmitted on PDCCHs in different time domains (e.g., DCI payload) are the same, a problem arises as to how the UE applies / interprets the time relationship indications of each PDCCH / DCI (e.g., the same value) to control the schedule.

[0044] Alternatively, if it is supported / allowed that the contents of DCI (e.g., DCI payload) transmitted on PDCCHs in different time domains are set differently, the question arises as to how the UE applies / interprets the time relationship indications (e.g., different values) of each PDCCH / DCI to control the schedule.

[0045] 3 shows an example of a case where a PDCCH is repeatedly transmitted (or arranged) in each of slots #n to #n+1. The PDCCH (or a control resource set) arranged in each slot may be arranged in the entire time domain of the slot (for example, all symbols), or may be arranged in a part of the time domain (for example, some consecutive or non-consecutive symbols).

[0046] In this case, the schedule of the physical shared channel may be controlled based on timing-related information (e.g., time domain resource allocation information) included in each PDCCH transmitted in different time domains (here, different slots). The PDCCHs transmitted in different time domains may be configured to schedule the same transport block (or the physical shared channel transmitting the same transport block).

[0047] However, when scheduling is performed using multiple PDCCHs / DCIs, a problem arises as to how to control the setting of timing-related information (e.g., time domain resource allocation information) included in each PDCCH / DCI or its interpretation in the UE.

[0048] The present inventors considered how to set time-related information contained in each PDCCH / DCI or interpret the time-related information in a UE when scheduling is performed using multiple PDCCHs / DCIs, and came up with the idea for this embodiment.

[0049] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Each of the following aspects may be used alone, or at least two of them may be combined and applied.

[0050] In addition, in the present disclosure, “A / B” may be read as at least one of A and B, and “A / B / C” may be read as at least one of A, B, and C.

[0051] (First aspect) In the first aspect, notification / setting of information related to PDCCH repeat transmission will be described.

[0052] The information on the PDCCH repeat transmission may be a transmission condition / transmission parameter applied to the PDCCH repeat transmission. The transmission condition / transmission parameter applied to the PDCCH repeat transmission may be at least one of the number of PDCCH repetitions (e.g., PDCCH repetition number), the time interval in which the PDCCH repetition is applied, and the interval / offset between each PDCCH in the PDCCH repeat transmission.

[0053] A PDCCH to which repeated transmission is applied (e.g., a multi-PDCCH) may be transmitted from a plurality of TRPs. A different QCL (or TCI, beam) may be applied to the multi-PDCCH (or the PDCCH transmitted from a different TRP). In the present disclosure, the PDCCH repeated transmission is applicable to the case where the PDCCH is transmitted from one or a plurality of TRPs.

[0054] Information related to PDCCH repeat transmission (e.g., the number of PDCCH repetitions) may be notified / configured to the UE from the network (e.g., a base station). Information related to PDCCH repeat transmission may be notified / configured to the UE based on at least one of the following options 1-1 to 1-2.

[0055] <Option 1-1> Information regarding PDCCH repeated transmission may be notified / configured from the base station to the UE using higher layer signaling (eg, at least one of an RRC parameter and a MAC CE).

[0056] <Option 1-2> Information regarding PDCCH repeat transmission may be dynamically notified from the base station to the UE using downlink control information (e.g., DCI). Information regarding PDCCH repeat transmission may be notified using a new field set in DCI, or may be notified using a field set in the existing system.

[0057] Information regarding PDCCH repeat transmission may be included in each PDCCH / DCI to which repeat transmission is applied. In this case, the number of PDCCH repetitions included in each PDCCH / DCI may be the same value. Alternatively, the number of PDCCH repetitions included in each PDCCH / DCI may be set to a different value (e.g., the remaining number of repetitions).

[0058] The size (e.g., the number of bits) of a field used to notify information related to repetitive transmission may be determined based on the maximum number of PDCCH repetitions. The UE may determine the maximum number of PDCCH repetitions based on capability information (e.g., UE capability) reported by the UE.

[0059] Alternatively, the maximum number of PDCCH repetitions may be notified / configured to the UE by the base station through higher layer signaling, etc. In this case, the base station may notify the UE of the number of PDCCH repetitions to be actually applied using DCI. The size (or the number of bits) of the field used for notifying the number of PDCCH repetitions may be determined based on the maximum number of PDCCH repetitions notified / configured through higher layer signaling.

[0060] Whether or not the notification of the number of PDCCH repetitions using DCI is applied may be set by a predetermined higher layer signaling. If the predetermined higher layer signaling is set, the UE may assume that a field for notifying the number of PDCCH repetitions is present in the DCI, and if the predetermined higher layer signaling is not set, the UE may assume that a field for notifying the number of PDCCH repetitions is not present in the DCI.

[0061] In this way, when PDCCH repeat transmission is applied, the base station notifies / configures information regarding PDCCH repeat transmission to the UE, thereby enabling the UE to properly grasp the transmission conditions / transmission parameters to be applied to the PDCCH repeat transmission.

[0062] (Second aspect) In the second aspect, a case where the same DCI payload content is transmitted by PDCCH repetitions (TDM PDCCH repetitions) transmitted in different time domains is described. That is, it corresponds to a case where the same DCI payload content is notified to each UE by multi-PDCCH.

[0063] The payload contents being the same may mean that the values ​​of all fields included in each DCI are set to the same, or may mean that the values ​​of some predetermined fields among the fields included in each DCI are set to the same.

[0064] The predetermined field may be a notification field of time related information. The time related information may be read as timing related information, time related indication, or timing related indication (e.g., timing related indication). For example, the predetermined field may be at least one of a time domain resource assignment field and a HARQ-ACK feedback timing indication (e.g., PDSCH-to-HARQ feedback timing indicator) field.

[0065] When a given physical shared channel is scheduled by multiple DCIs, each transmitted on a PDCCH assigned to a different time domain, and the contents (e.g., payload contents) of the multiple DCIs are identical, the UE may interpret / apply the time-related information (or timing-related information) included in the DCI based on a specific time reference.

[0066] The time reference may be read as a timing reference, a reference timing, a reference point, a time reference point, a reference in the time domain, or a reference point in the time domain.

[0067] The specific time reference may be a specific PDCCH (or a transmission timing of a specific PDCCH) among a plurality of PDCCHs that are repeatedly transmitted. For example, it may be the first PDCCH transmitted (or received), or the first PDCCH allocated in the time domain. The UE may use the first symbol of the first transmitted PDCCH as the time reference, or the last symbol of the PDCCH.

[0068] For example, the UE may determine the time domain resources of a signal / channel (e.g., a physical shared channel) scheduled in each DCI based on a specific time reference and a notification field of time-related information included in each DCI (or at least one DCI).

[0069] For example, assume that the slot offset K0 specified in each DCI has the same value (e.g., K0=2) (see FIG. 4). The UE may determine that the PDSCH is scheduled in a slot (here, #n+2) that is K0 away from a specific time reference (here, the transmission timing (e.g., slot #n) of the first transmitted PDCCH #1 or DCI #1).

[0070] In Fig. 4, a case where a PDSCH is scheduled using multiple PDCCHs / multiple DCIs is shown, but this is not limiting. When a PUSCH is scheduled using multiple PDCCHs / multiple DCIs, the UE may determine that a PUSCH is scheduled in a slot that is K2 away from a specific time reference (e.g., the transmission timing (e.g., slot #n) of the first transmitted PDCCH #1 or DCI #1). Alternatively, the same can be applied to an operation in which a time domain (e.g., transmission timing / reception timing) is determined based on the PDCCH / DCI.

[0071] 4 shows a case where multiple PDCCHs / multiple DCIs are assigned to different slots (inter-slot PDCCH repetition), but this is not limiting. Multiple PDCCHs / multiple DCIs may be assigned to the same slot (e.g., different sub-slots / mini-slots / symbols in the same slot).

[0072] 5A shows a case where multiple PDCCHs / multiple DCIs are allocated within the same slot (intra-slot PDCCH repetition). Here, PDCCH#1 and PDCCH#2 are allocated to different symbols in slot#n, and the slot offset K0 value indicated by DCI#1 transmitted by PDCCH#1 and DCI#2 transmitted by PDCCH#2 is the same (here, 2).

[0073] The UE may interpret / apply the time-related information included in each DCI using a specific PDCCH (here, PDCCH#1) among the multiple PDCCHs as a time reference.

[0074] FIG. 5B shows a case where multiple PDCCHs / multiple DCIs are allocated within the same mini-slot (intra-mini-slot PDCCH repetition). A mini-slot may be a time interval consisting of a predetermined symbol (for example, 2, 3, or 7 symbols). A mini-slot may be read as a sub-slot. Alternatively, a mini-slot may simply be set as a time shorter than a sub-slot.

[0075] Here, PDCCH#1 and PDCCH#2 are assigned to different symbols (e.g., adjacent symbols) included in slot#n, and the slot offset K0 values ​​indicated in DCI#1 transmitted on PDCCH#1 and DCI#2 transmitted on PDCCH#2 are the same (here, 2).

[0076] The UE may interpret / apply the time-related information included in each DCI using a specific PDCCH (here, PDCCH#1) among the multiple PDCCHs as a time reference.

[0077] Here, the case where the first transmitted PDCCH is used as the time reference is shown, but is not limited to this. Another PDCCH (for example, the PDCCH that is transmitted last or that is arranged last in the time domain) may be used as the time reference. In this case, the UE may interpret / apply the time-related information based on the last transmitted PDCCH.

[0078] Alternatively, the specific PDCCH / DCI serving as the time reference may be determined based on a predetermined parameter corresponding to each PDCCH (or a CORESET of each PDCCH). The predetermined parameter may be at least one of a TRP index, a CORESET pool index, and a TCI state ID.

[0079] For example, the specific PDCCH / DCI may be a PDCCH / DCI corresponding to the minimum / maximum TRP index (or CORESET pool index) among repeatedly transmitted PDCCCHs (eg, multi-PDCCH / multi-DCI).

[0080] Alternatively, the specific PDCCH / DCI may be a PDCCH / DCI corresponding to the minimum / maximum TCI state ID among the repeatedly transmitted PDCCCHs (e.g., multi-PDCCH / multi-DCI). The TCI state corresponding to the PDCCH / DCI may be a TCI state corresponding to a CORESET used for transmitting the PDCCH / DCI. In addition, when a CORESET pool index is set, a CORESET corresponding to the minimum / maximum CORESET pool index may be selected.

[0081] The multiple PDCCHs (or multiple DCIs) to which the repeated transmission is applied may be configured to be associated with each other with respect to a predetermined transmission parameter (or among one or more predetermined transmission parameters). The predetermined transmission parameter may be at least one of a control channel element (CCE), a resource element group (REG), a search space, a search space set, and a CORESET.

[0082] For example, a predetermined transmission parameter may be set in association between a PDCCH serving as a time reference (e.g., a PDCCH transmitted first in repeated transmission) and other PDCCHs. As an example, a predetermined transmission parameter may be set based on the repetition order (or associated with the transmission order) between transmission parameters of a plurality of PDCCHs to which repetition is applied. The UE can determine the transmission order of each PDCCH (e.g., the PDCCH transmitted first) based on information related to the repetition of the PDCCH (e.g., the number of repetitions, the repetition period, etc.) and the transmission parameters corresponding to each PDCCH.

[0083] In this way, by configuring the UE to recognize / understand the PDCCH that serves as a time reference from other PDCCHs, even if the UE fails to detect the PDCCH that serves as a time reference, it can properly interpret / apply the time-related information (e.g., the same value) contained in each DCI to transmit and receive.

[0084] When DL transmission / UL transmission is scheduled using repeated transmission of PDCCH, the transmission timing of each PDCCH may be restricted. For example, the transmission timing of each PDCCH may be controlled based on at least one of the following options 2-1 to 2-2.

[0085] <Option 2-1> PDCCH repetition transmissions (e.g., TDM PDCCH repetitions) allocated to different time domains may be configured so that inter-slot PDCCH repetitions (see FIG. 6A) are not supported. In other words, at least one of intra-slot PDCCH repetitions and intra-mini-slot PDCCH repetitions (see FIG. 6B) may be supported.

[0086] There may be a case where the UE misses detection of the PDCCH serving as the time reference (e.g., the first transmitted PDCCH) and mistakenly recognizes another PDCCH as the time reference, and interprets / applies the time-related information included in each DCI. When applying PDCCH repeated transmission in the same slot, even if the UE misses detection of the PDCCH serving as the time reference and recognizes another PDCCH as the time reference, the same slot is set as the time reference.

[0087] Therefore, even if the UE fails to detect the PDCCH serving as a time reference, it can properly determine the time domain resource of the physical shared channel, the schedule of which is controlled based on the slot-level offset.

[0088] <Option 2-2> PDCCH repetition transmissions allocated to different time regions (e.g., TDM PDCCH repetition) may be configured to support only intra-mini-slot PDCCH repetition. In other words, PDCCH repetition transmissions allocated to different time regions may be configured to support neither inter-slot PDCCH repetition nor intra-slot PDCCH repetition.

[0089] In such a case, if minislot level offset is supported, even if the UE misses detecting the PDCCH serving as the time reference and mistakenly recognizes another PDCCH as the time reference, the UE can properly determine the time domain resource of the physical shared channel to which the minislot level offset is applied.

[0090] <Time criteria field settings> In PDCCH repetitive transmission (e.g., TDM PDCCH repetition) allocated to different time domains, a field (e.g., a new field) for determining the PDCCH serving as a time reference may be set in the DCI. For example, a field indicating whether the PDCCH is the PDCCH serving as a time reference (e.g., the PDCCH that is transmitted first in the repetitive transmission) may be added to each PDCCH.

[0091] For example, a 1-bit specified field may be set, and when the specified field value is 1, it indicates that the PDCCH (or the first PDCCH) is the time reference, and when the specified field value is 0, it indicates that the PDCCH (or the first PDCCH) is not the time reference (see Figure 7A).

[0092] Alternatively, a predetermined field indicating the order of transmission in the time direction in repeated transmission may be set in the DCI. For example, a 2-bit predetermined field may be set, and a value of the predetermined field of 00 indicates that the PDCCH is a time reference PDCCH (or the first PDCCH), a value of 01 indicates that the PDCCH is the second PDCCH, a value of 10 indicates that the PDCCH is the third PDCCH, and a value of 11 indicates that the PDCCH is the fourth PDCCH (see FIG. 7B).

[0093] 7B shows a case where the predetermined field is set to 2 bits, but is not limited to this. The size (or the number of bits) of the predetermined field may be determined based on the maximum number of repeated transmissions.

[0094] In this way, in PDCCH repetitive transmissions allocated to different time domains (e.g., TDM PDCCH repetition), the contents of time-related information notified in DCI transmitted by each PDCCH are set to be the same, thereby making it possible to suppress an increase in DCI overhead. For example, assume that the slot offset and other parameters (e.g., start symbol S, length L) are set in association with each other (e.g., set corresponding to the DCI code point). In this case, by setting the slot offset of each DCI to the same value, it is not necessary to increase the number of combination candidates of the slot offset and other parameters.

[0095] (Third aspect) In the third aspect, a case will be described in which transmission of DCI with different payload contents (same DCI payload content) is supported / allowed by PDCCH repetitions (TDM PDCCH repetitions) transmitted in different time domains. In other words, this corresponds to a case in which different DCI payload contents are notified to UEs by multiple PDCCHs.

[0096] The difference in payload contents may refer to the case where the values ​​of some predetermined fields among the fields included in each DCI are set to the same value.

[0097] The predetermined field may be a notification field of time-related information (or timing-related information). For example, the predetermined field may be at least one of a time domain resource assignment field and a PDSCH-to-HARQ feedback timing indicator field.

[0098] When a given physical shared channel is scheduled by multiple DCIs, each transmitted on a PDCCH assigned to a different time domain, and cases in which the contents (e.g., payload contents) of the multiple DCIs are different are supported, the UE may interpret / apply time-related information (or timing-related information) included in the DCI based on a different time reference for each PDCCH / DCI.

[0099] For example, the UE may determine the time domain resources of a signal / channel (e.g., a physical shared channel) scheduled in each DCI based on a notification field of time-related information included in the DCI transmitted in each PDCCH and the PDCCH corresponding to each DCI (or the transmission timing of the PDCCH).

[0100] The values ​​of the time-related information included in each DCI may be different, but the actual timing (e.g., scheduled timing) indicated in the time-related information included in each DCI (e.g., time domain resource allocation of a physical shared channel) may be the same.

[0101] For example, assume that the value of slot offset K0 included in each DCI is different (see FIG. 8). The UE may determine the position / timing at which the PDSCH is scheduled based on the PDCCH corresponding to each DCI. Here, a case is shown in which slot offset 2 is specified by DCI#1 transmitted by PDCCH#1 assigned to slot #n, and slot offset 1 is specified by DCI#2 transmitted by PDCCH#2 assigned to slot #n+1.

[0102] The UE determines that the PDSCH is scheduled in a slot two slots away from the PDCCH #1 (here, slot #n+2) and one slot away from the PDCCH #2 (here, slot #n+2). The UE may assume that the same time resource (e.g., slot) is specified by the DCI transmitted in each repeated PDCCH.

[0103] Although the case where the PDSCH is scheduled using multiple PDCCHs / multiple DCIs is illustrated in FIG. 8, the present invention is not limited to this. When the PUSCH is scheduled using multiple PDCCHs / multiple DCIs, the UE may interpret / apply time-related information included in the DCI based on the timing of the PDCCHs corresponding to each DCI.

[0104] In inter-slot PDCCH repetition, if the slot-level timing indication in slot #n is p, the slot-level timing indication in slot #n+1 may be p-1.

[0105] In intra-slot PDCCH repetition, the slot-level timing notification included in all DCI transmitted in slot #n may be the same (e.g., p is included in all DCI). On the other hand, in intra-slot PDCCH repetition, if the slot-level timing notification in sub-slot #m is p, the sub-slot-level timing notification in slot #m+1 may be p-1.

[0106] In PDCCH repetition within a mini-slot (intra-mini-slot PDCCH repetition), the slot-level timing notification included in all DCI transmitted in slot #n may be the same (e.g., p is included in all DCI). In PDCCH repetition within a mini-slot (intra-mini-slot PDCCH repetition), the sub-slot-level timing notification included in all DCI transmitted in sub-slot #m may be the same (e.g., p is included in all DCI). On the other hand, in PDCCH repetition within a mini-slot (intra-mini-slot PDCCH repetition), if the slot-level timing notification in mini sub-slot #r is p, the sub-slot-level timing notification in mini-slot #r+1 may be p-1.

[0107] The fields other than the field of time-related information included in the DCI (e.g., the time domain resource allocation field) may be set to the same content (e.g., the same value / same bit value). The UE may assume that the values ​​of the fields other than the field of time-related information included in the repeatedly transmitted multi-DCI (e.g., the frequency domain resource allocation field, etc.) are set to the same value.

[0108] The multiple PDCCHs (or multiple DCIs) to which the repeated transmission is applied may be configured to be associated with each other with respect to a predetermined transmission parameter (or among one or more predetermined transmission parameters). The predetermined transmission parameter may be at least one of a control channel element (CCE), a resource element group (REG), a search space, a search space set, and a CORESET.

[0109] <Time criteria field settings> In PDCCH repetitive transmission (e.g., TDM PDCCH repetition) allocated to different time domains, a predetermined field (e.g., a new field) for determining the PDCCH serving as a time reference may be set in the DCI. For example, a predetermined field indicating whether the PDCCH is the PDCCH serving as a time reference (e.g., whether the PDCCH is the first PDCCH transmitted in the repetitive transmission) may be added to each PDCCH.

[0110] For example, a 1-bit specified field may be set, and when the specified field value is 1, it may indicate that the PDCCH (or the first PDCCH) is the time reference, and when the specified field value is 0, it may indicate that the PDCCH (or the first PDCCH) is not the time reference.

[0111] Alternatively, a predetermined field indicating the order of transmission in the time direction in repeated transmission may be set in the DCI. For example, a 2-bit predetermined field may be set, and a value of the predetermined field of 00 indicates that the PDCCH is a time reference PDCCH (or the first PDCCH), a value of 01 indicates that the PDCCH is the second PDCCH, a value of 10 indicates that the PDCCH is the third PDCCH, and a value of 11 indicates that the PDCCH is the fourth PDCCH.

[0112] (Variation 1) For PDCCH repetition using frequency division multiplexing (FDM) / space division multiplexing (SDM), the UE may assume that each PDCCH / DCI contains the same DCI payload content (e.g., at least time-related information). If the PDCCH repetition transmission uses FDM / SDM, this may be interpreted as, for example, multiple PDCCHs / multiple DCIs are transmitted in the same time domain (e.g., the same symbol).

[0113] In this case, the UE may interpret / apply the time-related information (or timing-related indication) included in the multi-PDCCH / multi-DCI based on at least one of the following options 3-1 to 3-2.

[0114] <Option 3-1> The UE may determine the time domain resource to be scheduled according to time-related information indicated in any PDCCH / DCI among the repeatedly transmitted PDCCCHs (eg, multi-PDCCH / multi-DCI).

[0115] <Option 3-2> The UE may determine the time domain resources to be scheduled according to time-related information indicated in a particular PDCCH / DCI among the repeatedly transmitted PDCCCHs (eg, multi-PDCCH / multi-DCI).

[0116] The specific PDCCH / DCH may be a PDCCH / DCI having a minimum / maximum frequency index (or a CCE index) among repeatedly transmitted PDCCCHs (eg, multi-PDCCH / multi-DCI).

[0117] Alternatively, the specific PDCCH / DCI may be a PDCCH / DCI corresponding to the minimum / maximum TRP index (or CORESET pool index) among repeatedly transmitted PDCCCHs (eg, multi-PDCCH / multi-DCI).

[0118] Alternatively, the specific PDCCH / DCI may be a PDCCH / DCI corresponding to the minimum / maximum TCI state ID among the repeatedly transmitted PDCCCHs (e.g., multi-PDCCH / multi-DCI). The TCI state corresponding to the PDCCH / DCI may be a TCI state corresponding to a CORESET used for transmitting the PDCCH / DCI. In addition, when a CORESET pool index is set, a CORESET corresponding to the minimum / maximum CORESET pool index may be selected.

[0119] The second and third aspects may be applied only to TDM PDCCH repetition schemes, or may be applied only to inter-slot / intra-slot / intra-mini-slot TDM PDCCH repetition schemes.

[0120] (Variation 2) The DAI may also include a Downlink Assignment Indicator (Index) (DAI) field, which may be split into a counter DAI (cDAI) and a total DAI (tDAI).

[0121] The counter DAI may indicate the counter value of downlink transmissions (PDSCH, data, TB) scheduled within a predetermined period. For example, the counter DAI in a DCI that schedules data within the predetermined period may indicate the number counted in the frequency domain (e.g., CC index order) first and then in the time domain (time index order) within the predetermined period.

[0122] The total DAI may indicate the sum (total number) of data scheduled within a given period. For example, the total DAI in a DCI that schedules data at a given time unit (e.g., PDCCH monitoring opportunity) within the given period may indicate the total number of data scheduled up to the given time unit (also called a point, timing, etc.) within the given period.

[0123] In a multi-TRP scenario, when PDCCHs are repeatedly transmitted from multiple TRPs, the question arises as to how to control (or how the UE interprets) the DAI field included in the DCI transmitted in each PDCCH.

[0124] If the DAI included in each DCI transmitted on each PDCCH is set to the same value (e.g., the same DCI payload applies to PDCCH repetitions), the UE may interpret / apply the DAI field based on at least one of the following options 4-1 to 4-2.

[0125] <Option 4-1> The DAI field in a repetitive PDCCH (or multi-DCI) may be determined based on a specific PDCCH (e.g., the first PDCCH transmitted in the repetition), i.e., the DAI field of each DCI may be counted (or counted up) only in the first PDCCH (or DCI) and not counted in other PDCCHs.

[0126] Also, the DCI field included in each DCI may be set to the count value in the first PDCCH / DCI. Note that, if the first PDCCH transmitted in the repetition is the first PDCCH in the counter DAI (for example, when DAI=0), the DAI included in each DCI may be 0 (not counted).

[0127] <Option 4-2> The DAI field in a repeated PDCCH (or multi-DCI) may be determined based on the PDCCH transmitted last in the repetition. In this case, the count value in the last PDCCH / DCI may be set to the DCI field included in each DCI. For example, when the number of repetitions is n, a value counted at least n times of the number of repetitions may be set to the DCI field of each DCI.

[0128] If application of different DCI payloads to PDCCH repetitions is supported, the UE may interpret / apply the DAI field based on at least one of Option 5-1 to Option 5-2 below.

[0129] <Option 5-1> The same value may be set to each DAI field in the PDCCH / DCI to which the repeated transmission is applied. In this case, option 4-1 or option 4-2 may be applied.

[0130] <Option 5-2> The DAI field in the repeated PDCCH (or multi-DCI) may be set to a different value. In this case, the count control of the DAI field in each DCI may be controlled based on a combination of the serving cell and the PDCCH monitoring occasion. Alternatively, it may be controlled based on a combination of at least one of the serving cell and the PDCCH monitoring occasion and the TRP index.

[0131] If different values ​​are set in the DAI fields included in each PDCCH / DCI (and the same value is set in the time domain resource allocation field), the UE may determine the PDCCH that serves as the time reference based on the DAI field (e.g., a counter DAI).

[0132] (UE capability information) The UE may report to the base station whether or not the PDCCH repetition is supported as UE capability information (UE capability). For example, the UE may report to the base station whether or not the UE supports a multiplexing method (TDM / SDM / FDM) applicable to the PDCCH repetition.

[0133] The UE may report to the base station whether it supports inter-slot PDCCH repetition, intra-slot PDCCH repetition, or intra-mini-slot PDCCH repetition for PDCCH repetition transmitted in different time domains (TDM PDCCH repetition).

[0134] In addition, the UE may report its capability regarding the maximum number of repetitions to the base station. The maximum number of repetitions may be set separately for multiple multiplexing methods (TDM / SDM / FDM) or may be set commonly.

[0135] The UE may report whether it supports identical or different DCI payload contents for a repeated PDCCH (e.g., inter-slot / intra-slot / intra-minislot TDM PDCCH repetition).

[0136] The UE may report to the base station whether or not it supports reporting of the number of repetitions based on the DCI.

[0137] The base station may control the repeated transmission of the PDCCH based on the capability information reported from the UE. In addition, the base station may notify / set the UE of the above-mentioned UE capability information by using higher layer signaling or the like.

[0138] (Wireless communication system) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0139] 9 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0140] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0141] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN) and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN and the LTE (E-UTRA) base station (eNB) is the SN.

[0142] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0143] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0144] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0145] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0146] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0147] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0148] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0149] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0150] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0151] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0152] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0153] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0154] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0155] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0156] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0157] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0158] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0159] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0160] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0161] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0162] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0163] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0164] (base station) 10 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0165] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0166] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0167] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0168] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0169] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0170] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0171] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0172] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0173] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0174] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0175] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0176] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0177] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0178] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0179] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0180] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0181] The transceiver 120 may transmit a plurality of pieces of downlink control information, each of which is transmitted using a plurality of downlink control channels allocated to different time regions.

[0182] The transceiver unit 120 controls the schedule of the physical shared channel by using multiple pieces of downlink control information, and when the contents of the timing-related information included in each piece of downlink control information are identical, the transceiver unit 120 may control the schedule of the physical shared channel by using timing-related instruction information with a specific downlink control channel as a time reference.

[0183] The transceiver unit 120 may control the schedule of the physical shared channel by using multiple pieces of downlink control information, and when a case is supported in which the contents of the timing-related information included in each piece of downlink control information are different, the transceiver unit 120 may control the schedule of the physical shared channel by using the timing-related information included in each piece of downlink control information, with the downlink control channel corresponding to each piece of downlink control information as a time reference.

[0184] (User terminal) 11 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0185] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0186] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0187] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0188] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0189] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0190] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0191] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0192] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0193] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0194] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0195] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0196] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0197] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0198] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0199] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0200] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220, the transmitting / receiving antenna 230, and the transmission path interface 240.

[0201] The transceiver 220 may receive a plurality of pieces of downlink control information that are respectively transmitted using a plurality of downlink control channels that are allocated to different time regions.

[0202] The control unit 210 controls at least one of reception and transmission of the physical shared channel scheduled by the multiple downlink control information, and when the contents of the timing-related information included in each of the multiple downlink control information are identical, the control unit 210 may determine at least one of the reception timing and transmission timing of the physical shared channel based on the timing-related information using a specific downlink control channel as a time reference.

[0203] The control unit 210 controls at least one of reception and transmission of the physical shared channel scheduled by the multiple downlink control information, and when a case is supported in which the contents of the timing-related information included in each of the multiple downlink control information are different, the control unit 210 may determine at least one of the reception timing and transmission timing of the physical shared channel based on the timing-related information included in each downlink control information, using the downlink control channel corresponding to each downlink control information as a time reference. The control unit 210 may assume that the same time region is specified by the timing-related information included in each downlink control information.

[0204] The multiple downlink control channels may be associated with each other and configured with respect to a predetermined transmission parameter.

[0205] Multiple downlink control channels may be allocated within the same slot, within the same subslot, or within the same minislot.

[0206] The multiple pieces of downlink control information may each include information regarding a specific piece of downlink control information, or information regarding a transmission order in the time domain.

[0207] Multiple downlink control channels may be supported for allocation among different slots.

[0208] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0209] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0210] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0211] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0212] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0213] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0214] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0215] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0216] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0217] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0218] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0219] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0220] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0221] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0222] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0223] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0224] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0225] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0226] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0227] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0228] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0229] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0230] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0231] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0232] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0233] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0234] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0235] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0236] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0237] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0238] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0239] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0240] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0241] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0242] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0243] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0244] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0245] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0246] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0247] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0248] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0249] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0250] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0251] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0252] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0253] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0254] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0255] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0256] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0257] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0258] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0259] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0260] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0261] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0262] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0263] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0264] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0265] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0266] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0267] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0268] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0269] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0270] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0271] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0272] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0273] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0274] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0275] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0276] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0277] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiving unit that receives a plurality of PDCCHs (Physical Downlink Control Channels) allocated to different time domains; A control unit that controls to use a PDCCH that is later in time among the plurality of PDCCHs as a time reference according to terminal processing based on the plurality of PDCCHs; having The receiving unit receives a plurality of DCIs (Downlink Control Information) respectively transmitted using the plurality of PDCCHs, The control unit controls counting of a counter DAI (Downlink Assignment Indicator) included in each of the plurality of DCIs, based on a specific PDCCH among the plurality of PDCCHs, assuming that the counter DAIs included in each of the plurality of DCIs have the same value.

2. The plurality of PDCCHs are linked between a plurality of search space sets.

2. The terminal according to claim 1 .

3. The multiple PDCCHs are allocated within the same slot.

2. The terminal according to claim 1 .

4. receiving a plurality of physical downlink control channels (PDCCHs) assigned to different time domains; A step of controlling to use a PDCCH that is later in time among the plurality of PDCCHs as a time reference according to terminal processing based on the plurality of PDCCHs; having The receiving step includes receiving a plurality of DCIs (Downlink Control Information) respectively transmitted using the plurality of PDCCHs; The wireless communication method for a terminal, further comprising: a step of controlling counting of a counter DAI (Downlink Assignment Indicator) included in each of the plurality of DCIs, based on a specific PDCCH among the plurality of PDCCHs, on the assumption that the counter DAIs included in each of the plurality of DCIs have the same value.

5. A transmitter that transmits a plurality of PDCCHs (Physical Downlink Control Channels) allocated to different time domains; A control unit that instructs a terminal to use a PDCCH that is later in time among the plurality of PDCCHs as a time reference according to terminal processing based on the plurality of PDCCHs; having The transmitter transmits a plurality of DCIs (Downlink Control Information) each of which is transmitted using the plurality of PDCCHs; The control unit instructs a terminal to control counts of counter DAIs (Downlink Assignment Indicators) included in each of the plurality of DCIs, based on a specific PDCCH among the plurality of PDCCHs, assuming that the counter DAIs included in each of the plurality of DCIs have the same value.

6. A system having a base station and a terminal, The base station, A transmitter that transmits a plurality of PDCCHs (Physical Downlink Control Channels) allocated to different time domains; A control unit that instructs a terminal to use a PDCCH that is later in time among the plurality of PDCCHs as a time reference according to terminal processing based on the plurality of PDCCHs, The terminal includes: A receiving unit for receiving the plurality of PDCCHs; A control unit that controls to use a later PDCCH among the plurality of PDCCHs as a time reference according to terminal processing based on the plurality of PDCCHs, The receiving unit receives a plurality of DCIs (Downlink Control Information) respectively transmitted using the plurality of PDCCHs, The control unit controls counting of a counter DAI (Downlink Assignment Indicator) included in each of the plurality of DCIs, assuming that the counter DAIs included in each of the plurality of DCIs have the same value, based on a specific PDCCH among the plurality of PDCCHs. A system characterized by:

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